My dd2 is 18mo, and gets really frustrated with her big sister who is 3.3. She snatches a toy off of dd1, and then dd1 bites her.
She also bites herself on the arm too. It's all new to me, as dd1 didn't do this, or I think she tried, I told her off, and she didn't do it again. Whereas, I will tell dd2 off, and she'll do it again later, even though I've told her off, and she's cried acknowledging that shes been told off.
Any other ideas? They'd be very much appreciated!